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Burger King's latest ad stunt is resulting in some less-than-flattering descriptions of its Whopper sandwich.

The hamburger chain unveiled a 15-second ad Wednesday designed to trigger smart speaker devices into reciting the definition of a Whopper, pulled from the website Wikipedia. But the website can be edited by users, and the definition had been changed to insert "cyanide" as an ingredient in one version. Another user later changed the definition to say the Whopper is "the worst hamburger product" sold by the chain.

Burger King, owned by Restaurant Brands International, says it is not behind the negative edits and that it has been trying to change the definition back. The ad is expected to run nationally Wednesday night on networks including Comedy Central, MTV and Bravo.